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Along with the development of the aviation technology and microelectronic technology, avionics system developed for the integrated, inteligent, modular, standardization and systematization. CAN bus has been widely applied due to its features of low cost, open, simple implementation, fast rate, more hooks node. And the new requirement for its reliability is puts forward. Many devices on the aircraft are attached to the CAN bus as nodes. If the bus goes down, A disaster would be occurred in the aircraft . Based on the analysis of CAN bus model, this paper proposes a double-redundancy CAN bus model, and gives the implementation method. Through practice verification, this method improves the reliability of the system Practically.